Concrete-mixer



i E. G. GRAHAM.

CONCRETE MIXER. APPLICATION vFILED ocT.21. 191s.

Patented Feb.- 1, *1921.

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6.- Grabar/2 j Eqs. GRAHAM. CONCRETE MIXER. APLlCATlON FILED 0 CT.21, 1919.

' Patented Feb. 1, 19.21l

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EDWIN G. GRAHAM, OF PALISADES, COLORADO.

CONCEETEJVLIXER.

Specification of Letters Patent.

Patented Feb. 1, 1921.

Application led October 21, 1919. Serial No.1;332,236.

To all whom t may concern:

Be it lrnown that I, EDwrN G. GRAHAM, a citizen oi the United States, residing at Palisades, in the county ol Mesa and State of Colorado, have invented new and use'iul improvements in Concre'te-MiXers, of which the following is a specification.

This invention relates to concrete minero and has tor its object the provision oi a concrete mixing device involving` the use ot a flexible sheet of canvas or other suitable material similar to a rolling door, in which the mixing action is accomplished by plac ing 'the aggregate upon the sheet and then lifting the sheet by the corners or by two opposite sides. u

in important object is the provision oi a device of this character in which wheels are provided for supporting a frame within which is journaled drums to which are se cured the ends of the iexible sheet, clutch :mechanism being provided between the wheels and drums whereby upon movement ot the device over the ground back and ttorth the sheet will be moved to cause mixing action oil the aggregate, the clutch arrangement being operable to cause the sheet to be elevated from the ground and supported in elevated position so that the device may be transported from place to place after the aggregate is mixed. y

W ith the above and other objects and advantages in view, the invention consists in the details oi construction to be hereinafter more i'ully described and claimed and illus-l trated in the accompanying drawings 1n which-n t lligure 1 is a side elevation of the device, Fig. Q is a plan view, lFig. 3 is a cross sectional View taken through one of the axles or drums, and n lig. Ll is a longitudinal section showing the clutch arrangement. y y

Referring more particularly to the drawings, l have shown my device as comprising a rectangular iframe l0 formed ot suitable side bars 1l which may be connected by cross bars if desired and to which is secured any suitable draft device l2 by means of which the device may be pulled from place to place.

Journaled within the frame l0 are drums i3 and 14 which are preferably square in cross section. Secured upon these drums are the ends of a sheet 15 of canvas or other suitable fiexible material upon which is dis- 4posed the gravel, sand and cement to be mined. Extending through the drumsll and let and rcvoluble therewith are axles 16 and 17, upon the ends of which are revolubly mounted wheels 18. It will .be seen that ordinarily the wheels rotate with respect to the 'frameand drums without affecting the position of theliexible sheet on the drums. i

Secured upon the axles at the ends thereof are ratchets 19 and 20 with which cooperate pawlsQl and 22 pivoted upon the frame bars 11. Other pawls 23 and 24 are mount ed upon the wheels 1,8 and are also movable into engagement with the ratchets 19 and 20, respectively. i v

Bolted upon the under sides of the frame bars ll are inclined plates 25 whichdiverge downwardly and which have their free edges bearing against the iiexible sheet l5 adja cent its connection with the drums.

In the operation oi the device, with the sheet 15 disposed 'flat upon the ground, the various constituents of' the concrete to be `mixed are placed upon the sheet. T he pawls and 24A are then moved into engagement with the ratchets 19 and 20, the pawls 21 and 22 are swung out of engagement with the ratchets, and the device is then pulled back and forth. When the device is pulled in one `direction it will be seen that the rotation of the wheels will result in winding of the sheet 15 upon one drum and unwinding i direction, it will be seen that the other drum will wind the flexible sheet and the drum which was'previously winding will unwind. its this is done it will be seen that the sheet l5 will be moved beneath the mass of aggregate thereon and as is well known or as can be practically demonstrated by experiment, this movementoit the sheet will result in thorough rio-minglingioi' the aggregate. The sheet must be relatively wide or the amount of aggregate relatively small so as to prevent the mass trom` slipping oil the edges of the sheet. When the constituents have been thus mixed and it is desired to transport the load to the place where it is desired to pour the same, it is first necessary to pull the device upon one of the drums. The device is then pulled in fthe other direction whereupon the drum 14 will also wind the opposite edge oi" the sheet thereonto. Both drums will then be held stationary and Will support the load and after the pawls 23 and 24 are disengaged fromY the ratchets the device is free to be moved from place to place without the wheels 18 affecting the position of the sheet. The function of the scraper blades 25 is to scrape the concrete from the sheet 15 as the sheet approaches the drums during their winding, as will be quite obvious.

` From the foregoing description and a study of the drawings it will be apparent that I have thus provided a very simply constructed and inexpensive device which is readily adapted for use in the mixing of concrete in a thorough andeliicient manner, the

' device being also so arranged as to provide means for transporting the mixture to the place where its use is desired.

While I have shown and described the preferred embodiment of my invention, it is of course to be understood that I reserve the right to make such changes in the form,

construction, and arrangement of parts as will not depart from the spirit of the invention or the scope of the subjoined claim.

Having thus described my invention, I claim:

A device oi the character described com prising` a trame, a pair of axles journaled transversel5v ot said iframe and arianged in spaced parallel relation, wheels rotatably mounted on said axles, drums sez-ured upon said axles to rotate therewith, a flexible sheet having,`- its ends secured t0 and adapted to wind upon saidv drums in opposite directions and having its intermediate portion adapted to depend so as to be on a level with the lower edge of the wheel, ratchets secured upon the ends of said axles with the teeth o the ratchets on one axle arranged oppositely to those et the atshets on the other axle, pawls pivoted upon said :trame and movable to be engaged with or disengaged from said ratchets, said pawls bein;r also oppositely disposed, and other pawls carried by the wheels and engageable with said ratchets whereby said ratchets and consequently said drums may be locked with respect to the wheels so :is to rotate therewith.

In testimony whereof I aliix mv signature.

EDWIN G. GRAHAM. 

